alarm applet is a GNOME panel applet that provides a way of either alerting the user that a particular time has arrived, or it can be used to run a command at a specified time. Think of it as an alarm clock for your desktop.

GNOME-Mud (formerly AMCL) is a Multi-User Dungeon (MUD) client that aims to make mudding a bit easier. It can define aliases, triggers, variables, keyboard shortcuts, and has a connection wizard for easy management of different player characters and MUDs.

Bakery is a C++ Framework for creating GNOME applications using gnomemm and gtkmm. It provides a Document/View architecture, but it doesn't force you to use the whole architecture. It makes it easy to start developing GNOME applications by inheriting and overriding.

Balsa is a Gnome e-mail client supporting POP3,
IMAP, and local mail delivery. It can be compiled
with multi-threading support for faster response,
and can do nifty things like read your GnomeCard
address book, use LDAP, and render HTML mail.

Batalla Naval is a multiplayer networked BattleShip game. It supports multiple
players and robots at the same time. Clients are available for GNOME, GTK,
XView, ncurses, and Win16. Servers are available for GNOME and ncurses. It has
support for GGZ Gaming Zone and IPv6.

Battstat is a battery status applet that monitors the battery charge level on a laptop. It displays different icons depending on the state of the power subsystem, and will warn if the power drops below a user configurable level. It uses the standard GNOME event system to play user configurable samples at certain events. It's available in binary form for Red Hat (.rpm), Debian (.deb) and FreeBSD (.tgz). You can also compile it yourself by downloading the source tarball (.tar.gz).

Beast is a powerful music composition and modular synthesis application. It offers multiple input methods like multitrack, piano roll, and pattern editing and supports skins. On the technical side, it has a wide range of abilities like sequencing, unlimited undo/redo history, real-time synthesis with multiprocessor support, full duplex 32-bit audio rendering, precise timing down to sample granularity, on demand loading of partial wave files, on the fly decoding of various sample formats, aliasing free oscillators, and full Scheme scripting support.